针对钢筋混凝土结构配筋复杂、施工难度大的问题, 在保证结构抗震性能的前提下, 提出了用曲线形夹式钢筋代替钢筋混凝土柱中的复合箍筋的新型配筋方式。对现有配筋方式的钢筋混凝土柱和用曲线形夹式钢筋置换中间箍筋的钢筋混凝土柱进行了试验研究, 设计了2组纵向钢筋配筋率、夹式钢筋置换率不同的截面为700 mm×700 mm的4个钢筋混凝土柱, 进行低周反复荷载试验。试验结果表明:2种配筋方式的极限承载力基本相当, 夹式钢筋能更有效地约束纵向受力钢筋和内部混凝土, 在反复加载下, 柱的滞回曲线更趋于丰满;与现有的配筋方式相比, 夹式钢筋增强了构件的耗能能力, 改善了构件的抗震性能。
Abstract
Aimed at the problems of great construction difficulty and complicated reinforcement of reinforced concrete structure, a new S-shaped clip reinforcement was developed as replacement of stirrups in reinforced concrete columns while retaining the equivalent anti-seismic performance. The tests of the reinforced concrete columns with conventional reinforcement and the S-shaped clip reinforcement replaced stirrups were carried out. Two group specimens with size of 700 mm×700 mm having different ratios of reinforcement and replacement of clip reinforcement were subjected to the low-cycle reversed loading test. The test results show that bearing capacities under two reinforcement patterns are nearly equivalent. The clip reinforcement could limit longitudinal buckling reinforcement and could restrain core concrete. Hysteretic curves of column tend to perfection. Compared with conventional reinforcement patterns, S-shaped clip reinforcement strengthens energy dissipation ability and anti-seismic performance of member.
关键词
桥梁工程 /
钢筋混凝土柱 /
低周反复荷载试验 /
抗震性能 /
夹式钢筋 /
滞回曲线
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Key words
bridge engeering /
reinforced concrete column /
low-cycle reversed loading test /
anti-seismic performance /
clip reinforcement /
hysteretic curve
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中图分类号：
U442.55
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参考文献
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脚注
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基金
国家自然科学基金项目(50309006)
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